. >> this turned out to be the first clear picture of suspect number 2, dzhokhar tsarnaev. her brother then posted that picture on facebook where more than 12,000 people shared it. >> i think i hit the lottery that i took that one picture that could have been helpful. so it's about the greatest, you know, win i could have ever had there to have helped. >> the picture is an example of how big a role social media played in this event. authorities were flooded with tips about the two suspects when images were shared and when the two brothers went on their rampage trying to escape lots of people followed the story on twitter. >> for those who have been on social media for several years now, there isn't any question that any news organization comes anywhere close to twitter. >> jeff is a professor of digital journalism at northeastern university in boston. he said twitter followers also posed a problem for law enforcement. >> you know, when they were actually conducting the search in watertown, yeah, just a few blocks away from me, you know, their concern was that people twitter